JPS5812177A - Magnetic recorder and reproducer - Google Patents

Abstract

PURPOSE:To reduce the driving torque of a magnetic recording medium, by reducing a contact area between the recording medium and the inner side of a cassette and decreasing the contact resistance. CONSTITUTION:A magnetic sheet cassette 12 consists of the covers 12a and 12b, and only the outer fringe part of a magnetic recording medium 8 is held by either inner side 12c or 12d. Thus the contact resistance does not increase since it is controlled by the sides 12c and 12d although the medium 8 has a malformation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing apparatus, and more particularly to a magnetic recording and reproducing apparatus C2 that performs magnetic recording and reproduction of a sheet-shaped magnetic recording medium.

A magnetic sheet cassette is known in which a flexible disk-shaped magnetic recording medium is housed in a cassette C2 made of cardboard, synthetic resin, etc., and the cassette C2 is mounted on a magnetic recording/reproducing device C2 to record and reproduce information.

This type of magnetic sheet cassette clamps and attaches a sheet-shaped magnetic recording medium to a drive mechanism, and by moving the positioning mechanism, the stationary magnetic recording medium is slightly moved to the correct position and the magnetic recording medium is moved to the correct position. Recording/playback is in progress.

A conventional example of such a structure is shown in FIG.

In FIG. 1, reference numeral 1 denotes a base provided on the side of the magnetic recording/reproducing device, and a recess 1a is formed in the center of the base 2, in which a drive ring 2 is accommodated. A rotating shaft 2a integral with the drive ring 2 is rotatably supported on a boss portion 1b of the base 1 via a bearing 3.

A rotating shaft 6 is provided above the drive ring 2 so as to be movable in the vertical direction, facing the rotating shaft 2a. A push ring 4 is rotatably supported on the rotating shaft 6 via a bearing 5.
A protrusion 4 protruding toward the drive ring 2 side of this push ring 4
A guide plate 7 is fixed to a.

On the other hand, the one designated by the reference numeral 12 is a magnetic sheet cassette, which is formed into a flat case shape from base paper, synthetic resin, etc.
A flexible sheet-like magnetic recording medium 8 is housed inside. This magnetic sheet cassette 12 is placed on a base 1, and the central portion of the magnetic sheet cassette 12 is held between the drive ring 2 and push ring 4 described above, and is rotated at a predetermined speed by a motor (not shown). Opening 1C provided on the base 1 side (
: is arranged with a magnetic head 9 for recording and reproducing,
A head pad 10 is provided facing the magnetic head 9 and holding the magnetic recording medium 8 therebetween.

Further, another pad 11 is provided facing the base 1, and the magnetic sheet cassette 12 is pressed by this pad 1'l+2 to prevent it from shaking.

Although such devices are widely used, they have the following drawbacks.

That is, the magnetic sheet cassette 12 that houses the magnetic recording medium 8 is made of, for example, cardboard, and is easily deformed and is prevented from shaking by pressing the pad 11. As shown in FIG. Motor torque increases. As a result, the motor becomes larger and power consumption increases. Further, when the clamping force of the magnetic recording medium 8 is weak, there is a large contact resistance, so that the clamping force of the drive ring 2 and the push ring 4 cannot clamp the magnetic recording medium 8 sufficiently, resulting in slipping of the magnetic recording medium 8.

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and is configured to reduce the contact resistance between the magnetic recording medium and the cassette, thereby reducing the driving torque of the magnetic recording medium. The purpose of the present invention is to provide a magnetic recording/reproducing device that has the following characteristics.

In order to achieve the above object, the present invention (2) employs a structure that reduces the contact area between the C2 magnetic recording medium and the inner surface of the cassette, thereby reducing contact resistance.

Hereinafter, the present invention will be explained in detail based on the embodiment shown in the drawings.

FIGS. 2 and 3 illustrate one embodiment of the present invention, and the same or corresponding parts as in FIG. 1 are denoted by the same reference numerals, and their explanation will be omitted.

This embodiment C; if there is, the magnetic sheet cassette 12 is
It is formed from a pair of covers 12a and 12b, and a narrow space 13 in the vertical direction is formed at the inner peripheral edge of the cover. The portion other than this space 13 is a large space 14 in which the magnetic recording medium 8 can freely rotate. The magnetic sheet cassette 12 is usually made of a material 2 having a certain degree of hardness, such as ABS wood.

Since the magnetic sheet cassette 12 has such a structure, only the outer peripheral edge of the magnetic recording medium 8 is covered with the upper and lower covers 1.
It is held in the cassette 12 with only one of the inner surfaces 12c and 12d of 2a and 12b in contact with C. Therefore, the upper and lower covers 1 form a large space 14.
The inner surfaces 12e and 12'f of 2a and 12b are not contacted.

In addition, the magnetic sheet cassette 12 is C: as shown in FIG.
The upper and lower covers have an opening 12g formed in the center thereof into which the drive ring and the push ring fit, and the left and right sides C of the opening 12g are formed.
: is formed with an opening 12h for the index, and furthermore,
An opening 12i into which the magnetic head 9 fits and moves is formed.

By the way, the height from the reference surface 1d of the base 1 to the upper end 2b of one drive source 2 is H, and the height from the reference surface 1d to the magnetic head 9 is
The height of the upper surface 9a etc. is L, the height to the inner surface 12d of the space 13 with which the magnetic recording medium 8 contacts is N, and the reference plane 1 is
If the height from d to the butting surface with the upper and lower covers 128° 12b is M, and the height from the reference 9 surface 1d to the inner surface 12c of the space 13 of the upper cover 12a is 0, then H>N
, L>N, and L≦H.

Therefore, when the magnetic recording medium 8 is clamped between the drive ring 2 and the push ring 4, the magnetic recording medium 8 floats out of contact with the cassette 12, and the contact resistance between the magnetic recording medium 8 and the magnetic sheet cassette increases. decreases significantly.

Further, even if the magnetic recording medium 8 is deformed, it is restricted between the inner surfaces 12c and 12d of the cassette 12, so that significant deformation can be prevented. Then, magnetic recording medium 8 and cassette 1
Even if the inner surfaces 12c and 12d of 2 contact each other, the contact area is small, so the overall contact resistance can be significantly reduced.

Furthermore, the material of the magnetic sheet cassette 12 is a hexagonal resin, etc. 6
Since two cassettes are relatively hard, when fixed on the reference surface 1d, there is significantly less deformation compared to a cassette made of cardboard or the like, and the cassette can be fixed more strongly.

In this embodiment, the relationship C2 is set such that L≦H, but in this case, as the magnetic head 9 approaches the center of the magnetic recording medium 8, the magnetic head 9 must be brought into contact with. That is, the magnetic recording medium 8 approaches the center direction of the magnetic recording medium 8 (as the magnetic recording medium 8
There is a drawback that a strong force is required to press the magnetic head 9 against the magnetic head 9, but this drawback is due to the relationship L≧H (
Second, since the magnetic head 9, a rigid body, moves while lifting the magnetic recording medium 8, the pressing force on the magnetic head 9 can be reduced.

In addition to the above-mentioned dimensional relationship, for example, if L≧H, H>N, and L>N are established, the above-mentioned effects will be further enhanced.

From the above description, it is clear that ≦2According to the present invention, the contact portion between the magnetic recording medium housed in the magnetic sheet cassette and the magnetic sheet cassette is formed on the inner surface near the outer periphery of the magnetic sheet cassette. By adopting a structure in which only the sides of the space are used, the contact resistance between the magnetic recording medium and the magnetic sheet cassette is significantly reduced, and as a result, the driving torque for rotating the magnetic recording medium is reduced, making it possible to use a small and inexpensive motor. can be used to achieve significant cost reductions.

[Brief explanation of the drawing]

FIG. 4 is a perspective view of the air sheet cassette, and FIG. 4 is a sectional view taken along the line ■--■ in FIG. 3. 1...Base 2...Drive ring 4...Press ring End...Magnetic recording medium 9...Magnetic head 12...Magnetic sheet cassette 13...Small space. Procedural amendment (voluntary) August 1911 Patent Office Multi-official Haruki Shimada 1, Indication of the case 1989 Patent Application No. 109400 2, Title of the invention Magnetic recording and reproducing device 3, Person making the amendment Related Patent Applicant 4, Agent 〒+62” Story 03 (268) 2481&
t1(2) Change “drive to” in the 20th line of the 4th bag to “[recommendation]”
Correct.

Claims (2)

[Claims] (1) A drive device that holds and rotates a magnetic recording medium;
In a magnetic recording and reproducing device comprising a magnetic head for recording and reproducing information on a magnetic recording medium and a hard cassette for accommodating the magnetic recording medium, the outer peripheral edge of the magnetic recording medium is located near the outer peripheral edge g2 of the cassette. A small space is provided in which the magnetic recording medium is inserted, and the magnetic recording medium and
C: A magnetic recording and reproducing device characterized in that it is configured so that it does not come into contact with the inner surface of a cassette. (2) Lower part C of the inner surface of the small space formed near the inner peripheral edge of the cassette that houses the magnetic recording medium: The distance between the inner surface and the reference surface is the magnetic recording medium of the magnetic head. 2. The magnetic recording and reproducing apparatus according to claim 1, wherein the distance is smaller than the distance from the contact surface to the reference surface.